Files
MinecraftConsoles/Minecraft.Client
kuwacom f8cbd4f844 fix: fix multiplayer player data mix between different players bug
Fixes a Win64 multiplayer issue where player data (`players/*.dat`) could be mismatched because identity was effectively tied to connection-order `smallId` XUIDs.
Introduces a deterministic username-derived persistent XUID and integrates it into the existing XUID-based save pipeline.

- Added `Windows64_NameXuid` for deterministic `name -> persistent xuid` resolution
- On Win64 login (`PlayerList`), set `ServerPlayer::xuid` from username-based resolver
- Aligned local player `xuid` assignment (`Minecraft`) for create/init/respawn paths to use the same resolver
- Added Win64 local-self guard in `ClientConnection::handleAddPlayer` using name match to avoid duplicate local remote-player creation
- Kept `IQNet::GetPlayerByXuid` compatibility fallback behavior, while extending lookup to also resolve username-based XUIDs
- Moved implementation to `Minecraft.Client/Windows64/Windows64_NameXuid.h`; kept legacy `Win64NameXuid.h` as compatibility include

Rename migration is intentionally out of scope (same-name identity only).
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========================================================================
    Xbox 360 APPLICATION : Minecraft.Client Project Overview
========================================================================

AppWizard has created this Minecraft.Client application for you.  

This file contains a summary of what you will find in each of the files that
make up your Minecraft.Client application.

Minecraft.Client.vcxproj
    This is the main project file for VC++ projects generated using an Application Wizard. 
    It contains information about the version of Visual C++ that generated the file, and 
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    Application Wizard.

Minecraft.Client.cpp
    This is the main application source file.



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